Mineral and Nitrogen Nutrition in Plants
Multiple Choice Questions and Answers
1. Synthesis of indole acetic acid in plant requires
(a) copper
(b) calcium
(c) molybdenum
(d) zinc
Answer: (d) zinc
2. Mineral constituent of chlorophyll is
(a) iron
(b) magnesium
(c) calcium
(d) potassium
Answer: (b) magnesium
3. Absorption of water and calcium is increased by
(a) manganese
(b) zinc
(c) copper
(d) boron
Answer: (d) boron
4. Active uptake of minerals by roots mainly depends on
(a) availability of oxygen
(b) light
(c) temperature
(d) availability of carbon dioxide
Answer: (a) availability of oxygen
5. Oxygen is referred to as a macronutrient because it is
(a) availability of oxygen
(b) required in relatively large quantities
(c) generated by the plants during photosynthesis
(d) required in various physiological processes
Answer: (b) required in relatively large quantities
6. The deficiency of nitrogen in plants develops colouration due to the synthesis of
(a) adenine
(b) adenosine diphosphate
(c) anthocyanin
(d) adenosine triphosphate
Answer: (c) anthocyanin
7. Micronutrients are elements which are
(a) required by the plants in large quantities
(b) required by the plants in traces or small quantities
(c) not all required by the plants
(d) synthesized in the plants
Answer: (b) required by the plants in traces or small quantities
8. The major portion of the dry weight of plants comprises of
(a) carbon, hydrogen and oxygen
(b) zinc, copper and iron
(c) calcium, potassium and magnesium
(d) nitrogen, sulphur and phosphorus
Answer: (a) carbon, hydrogen and oxygen
9. Root hairs are the extensions of
(a) epiblema cells
(b) cortex cells
(c) pericycle cells
(d) xylem tracheids
Answer: (a) epiblema cells
10. Passive absorption of minerals takes place through
(a) diffusion and ionic-exchange
(b) osmosis
(c) transpiration pull
(d) none of these
Answer: (a) diffusion and ionic-exchange
11. In nitrate assimilation, reduction of nitrates to ammonia is mediated by
(a) nitrate reductase
(b) nitrite reductase
(c) both a and b
(d) none of these
Answer: (c) both a and b
12. Which of the following convert the ammonia to nitrites?
(a) nitrosomonas
(b) nitrococcus
(c) nitrobacter
(d) both a and b
Answer: (d) both a and b
13. The mineral constituents of cell wall is
(a) iron
(b) magnesium
(c) potassium
(d) calcium
Answer: (d) calcium
14. Active uptake of minerals by roots depends on the
(a) availability of oxygen
(b) light
(c) temperature
(d) availability of carbon dioxide
Answer: (a) availability of oxygen
15. In nitrogen fixation
(a) plants convert atmospheric nitrogen to nitrates
(b) plants absorb ammonia from the soil
(c) the bacteria all housed on the plant roots
(d) the enzyme nitrogenase produces ammonia from gaseous nitrogen
Answer: (a) plants convert atmospheric nitrogen to nitrates
16. A fall in the ascorbic acid content in the plants is due to the deficiency of
(a) molybdenum
(b) zinc
(c) copper
(d) boron
Answer: (a) molybdenum
17. Biological fixation of nitrogen is helped by
(a) zinc
(b) copper
(c) boron
(d) molybdenum
Answer: (d) molybdenum
18. Which of the following is an insectivorous plant?
(a) Nepenthes
(b) Solanum
(c) Cuscuta
(d) Asparagus
Answer: (a) Nepenthes
19. Which is the correct statement?
(a) a parasite obtains the food from dead or organic matter
(b) a parasite obtains food, water and minerals from the body of living organisms called hosts
(c) insectivorous plants are parasites on host of green plants
(d) Cuscuta is a host
Answer: (b) a parasite obtains food, water and minerals from the body of living organisms called hosts
20. Name the plant parasite
(a) Cuscuta
(b) Utricularia
(c) Rhizopus
(d) Green plants
Answer: (a) Cuscuta
21. Roots can absorb minerals from the soil when they are in
(a) solid state
(b) liquid state
(c) ionic state
(d) gaseous state
Answer: (a) solid state
22. Chlorosis in nitrogen different plants appears
(a) in the young leaves only
(b) in the mature leaves only
(c) first in the mature leaves and then in the young leaves
(d) first in the young leaves and then in the mature leaves
Answer: (b) in the mature leaves only
23. Chlorosis is
(a) production of abundant leaves in a plant
(b) the yellowing of leaves due to loss of chlorophyll
(c) the yellowing of leaves due to increase in chlorophyll content
(d) the production of a very few leaves in a plant
Answer: (b) the yellowing of leaves due to loss of chlorophyll
24. Chlorosis in sulphur deficiency plants appears
(a) in the young leaves only
(b) first in the young leaves and then in the mature leaves
(c) in the mature leaves only
(d) first the in the mature leaves and then in the young leaves
Answer: (b) first in the young leaves and then in the mature leaves
25. Synthesis of indole acetic acid in plants require
(a) copper
(b) potassium
(c) zinc
(d) calcium
Answer: (c) zinc
26. Interveinal necrosis in lemon leaves is caused by the deficiency of
(a) molybdenum
(b) boron
(c) zinc
(d) copper
Answer: (c) zinc
27. Absorption of water and calcium is increased by
(a) copper
(b) zinc
(c) boron
(d) manganese
Answer: (c) boron
28. Which of the following is a macronutrient?
(a) manganese
(b) copper
(c) magnesium
(d) zinc
Answer: (c) magnesium
29. The macro nutrients are elements which are
(a) not all required by the plants
(b) harmful to the plants
(c) required by the plants in traces
(d) required by the plants in large quantities
Answer: (d) required by the plants in large quantities
30. The excess of nitrogen supply to plants produces
(a) no leaves at all
(b) yellow leaves
(c) less number of leaves
(d) dark-green leaves
Answer: (d) dark-green leaves
31. Which of the following is a macro micronutrient?
(a) iron
(b) magnesium
(c) potassium
(d) calcium
Answer: (a) iron
32. Manganese is a micronutrient because it is
(a) required by the plants in large quantities
(b) required by the plant in small quantities
(c) traceable in the soil
(d) found in the soil in small quantities
Answer: (b) required by the plant in small quantities
33. The drought spot of apples is caused by the deficiency of
(a) boron
(b) copper
(c) zinc
(d) molybdenum
Answer: (a) boron
34. Elements which are required by plants in minute quantities are called
(a) trace elements
(b) macro elements micro
(c) micro elements
(d) none
Answer: (a) trace elements
35. Carbon is absorbed by plants as
(a) carbon monoxide
(b) carbon dioxide
(c) both
(d) none
Answer: (b) carbon dioxide
36. Elements required by the plants in large quantities are called
(a) trace elements
(b) macro elements
(c) micro elements
(d) macronutrients
Answer: (d) macronutrients
37. Oxygen is absorbed in molecular form from …… by the plants
(a) air
(b) water
(c) soil
(d) none
Answer: (a) air
38. Deficiency of ……….. causes death of the stem and roots
(a) copper
(b) zinc
(c) molybdenum
(d) calcium
Answer: (d) calcium
39. Deficiency of copper in Citrus results in a disease known as
(a) dieback
(b) chlorosis
(c) necrosis
(d) none
Answer: (a) dieback
40. Drought rot of apples is caused by the deficiency of
(a) boron
(b) zinc
(c) molybdenum
(d) calcium
Answer: (a) boron
41. Technique of culturing plants in nutrient solutions is known as
(a) hydroponics
(b) water culture
(c) sand culture
(d) none
Answer: (a) hydroponics
42. NPK means
(a) nitrogen, phosphorus and potassium
(b) sodium, potassium and phosphorus
(c) both a and b
(d) none of the above
Answer: (a) nitrogen, phosphorus and potassium
43. The conversion of ammonia to nitrates is called
(a) ammonification
(b) nitrification
(c) denitrification
(d) none
Answer: (b) nitrification
44. The process of biological nitrogen fixation requires a strong reducing agent and
(a) ATP
(b) GTP
(c) ADP
(d) all of the above
Answer: (a) ATP
45. The best known nitrogen fixing bacterium is
(a) Clostridium
(b) Cyanobacteria
(c) Rhizobium
(d) All
Answer: (c) Rhizobium
46. A ……….pinkish reddish pigment in root nodules of leguminous plants is leg haemoglobin
(a) greenish
(b) yellowish
(c) greyish
(d) pinkish-reddish
Answer: (d) pinkish-reddish
47. Plants which synthesise their own food are called
(a) autotrophs
(b) heterotrophs
(c) herbivores
(d) carnivores
Answer: (a) autotrophs
48. Yellowing of leaves due to loss of chlorophyll is
(a) chlorosis
(b) necrosis
(c) die-back
(d) none
Answer: (a) chlorosis
49. Localized death of tissues causes
(a) chlorosis
(b) necrosis
(c) die-back
(d) abscission
Answer: (b) necrosis
50. ‘Water core’ of turnip is caused by the deficiency of
(a) boron
(b) zinc
(c) molybdenum
(d) calcium
Answer: (d) calcium